If your goal is better fuel economy and want to stay with a carb, you will be further ahead using a Q-Jet than a holley. The reason is the Q-Jet uses a jet and variable primary needle. So you set the power primary mix using the primary jet and then set your cruise mixture by varing the primary needle (big dia.) size.
Before I yanked my 292 out of my '51 GMC I was running a 600 holley, full length headers, mild comp cam and lump port heads. The fuel mileage sucked at 12-13 mpg with an 700R4 and 3:50 rear gears. Personally I think the 292 is not the best choice if you want mileage.
Alternative go TBI.
Last edited by efi-diy; 05/29/08 03:13 PM.
